US5808475A - Semiconductor probe card for low current measurements - Google Patents

Semiconductor probe card for low current measurements Download PDF

Info

Publication number
US5808475A
US5808475A US08/660,441 US66044196A US5808475A US 5808475 A US5808475 A US 5808475A US 66044196 A US66044196 A US 66044196A US 5808475 A US5808475 A US 5808475A
Authority
US
United States
Prior art keywords
contacts
probe
board
feed
probe card
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US08/660,441
Inventor
William Knauer
Robert Bennett
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Keithley Instruments LLC
Original Assignee
Keithley Instruments LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Keithley Instruments LLC filed Critical Keithley Instruments LLC
Priority to US08/660,441 priority Critical patent/US5808475A/en
Assigned to KEITHLEY INSTRUMENTS, INC. reassignment KEITHLEY INSTRUMENTS, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BENNETT, ROBERT, KNAUER, WILLIAM
Application granted granted Critical
Publication of US5808475A publication Critical patent/US5808475A/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
    • G01R1/02—General constructional details
    • G01R1/06—Measuring leads; Measuring probes
    • G01R1/067—Measuring probes
    • G01R1/073—Multiple probes
    • G01R1/07307—Multiple probes with individual probe elements, e.g. needles, cantilever beams or bump contacts, fixed in relation to each other, e.g. bed of nails fixture or probe card
    • G01R1/07364—Multiple probes with individual probe elements, e.g. needles, cantilever beams or bump contacts, fixed in relation to each other, e.g. bed of nails fixture or probe card with provisions for altering position, number or connection of probe tips; Adapting to differences in pitch
    • G01R1/07378—Multiple probes with individual probe elements, e.g. needles, cantilever beams or bump contacts, fixed in relation to each other, e.g. bed of nails fixture or probe card with provisions for altering position, number or connection of probe tips; Adapting to differences in pitch using an intermediate adapter, e.g. space transformers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
    • G01R1/02—General constructional details
    • G01R1/04—Housings; Supporting members; Arrangements of terminals
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
    • G01R1/02—General constructional details
    • G01R1/06—Measuring leads; Measuring probes
    • G01R1/067—Measuring probes
    • G01R1/073—Multiple probes
    • G01R1/07307—Multiple probes with individual probe elements, e.g. needles, cantilever beams or bump contacts, fixed in relation to each other, e.g. bed of nails fixture or probe card
    • G01R1/07342—Multiple probes with individual probe elements, e.g. needles, cantilever beams or bump contacts, fixed in relation to each other, e.g. bed of nails fixture or probe card the body of the probe being at an angle other than perpendicular to test object, e.g. probe card

Definitions

  • the invention relates to the field of semiconductor testing equipment and, in particular, to probe cards for semiconductor test equipment.
  • U.S. Pat. No. 4,983,907 shows a prior art probe card, and is incorporated herein in its entirety by reference.
  • This card is intended for alternating current tests. It is unsuitable for very low current direct current tests, because charge carriers can move into (and out of) the dielectric material of the printed circuit boards from the traces carrying the test signals, resulting in incorrect measurements and/or excessive measurement times. For example, when currents smaller than 10 -12 amperes are involved, the dielectric absorption of the typical glass-epoxy circuit board is sufficient to throw off measurements and to require settling times of as much as one-half hour.
  • Teflon Tetrafluoroethylene
  • a probe card for providing an electrical interface between a plurality of test lines and a device under test includes a contact board having a plurality of feed-through contacts therethrough.
  • the contacts include a conductive pin surrounded longitudinally by an electrically insulating material sheathed in a conductive material.
  • the pin has a first and second end.
  • the test lines are electrically connectable to the feed-through contacts at the first end and the conductive material sheath is connectable to a reference voltage.
  • the probe board has a plurality of contact probes mounted on said probe board for contacting the device under test. Each probe has an electrical connection terminal, the connection terminal being connected by a wire to at least one of the feed-through contacts at the second end.
  • the card is used for connecting a measurement device having a plurality of test lines to a device under test to allow the utilization of currents of less than 10 -12 amperes in the measurement of electrical parameters by connecting the probe card between said measurement device and the device under test.
  • FIG. 1 is a perspective view of a probe card according to the invention.
  • FIG. 2 is an enlarged cross sectional side elevational view of a portion of a probe card according to the invention.
  • FIG. 3 is an enlarged top plan view of a portion of a contact board according to the invention.
  • a probe card 10 is formed from a contact board 12 and a probe board 14.
  • the boards 12, 14 are structurally attached to each other by a series of spacers 16 and are each in the form of a printed circuit board (e.g., glass-epoxy boards with electrically conductive gold traces).
  • Ceramic blade probes 18 are attached to guard traces 20 on the probe board 14.
  • the guard traces 20 on the probe board 14 are electrically connected to guard traces 22 on the contact board 12 by the mating of a pin 24 on the contact board 12 and a socket 26 on the probe board 14.
  • the ceramic blade probes 18 are covered on one side (opposite the side shown in FIG. 2) and on the mounting edge 28 by a conductive material.
  • the mounting edge 28 is soldered to the guard traces 20 to provide both an electrical and structural connection.
  • the other side of the probes 18 have a signal conductor 30 terminating in a needle tip 32.
  • the needle tip 32 is used to make contact with an unshown device under test.
  • the blade probes 18 may be, for example, microstrip ceramic blade probes manufactured by Cerprobe Corporation of Tempe, Ariz.
  • a pin 34 is soldered to the signal conductor 30 to removably mate with a socket 36 soldered to one or more wires 38, 40 to be connected to the blade probe 18.
  • the wire 38 may be a "force” connection between the test equipment and the device under test and the wire 40 may be a “sense” connection between the test equipment and the device under test.
  • the pin and sockets 34, 36 and the pin and sockets 24, 26 provide a convenient way to separate the boards 12, 14 to allow the desired placement of blade probes 18 for a particular application.
  • coaxial feed-through contacts 42 mounted into holes in the contact board 12.
  • the holes in the contact board are plated through as part of the guard traces 22 and the feed-through contacts 42 are press-fit into the board 12.
  • Each feed-through contact 42 includes a conductive pin 44 surrounded by a low dielectric absorption material 46.
  • the material 46 may be, for example, tetrafluoroethylene (e.g., Teflon).
  • each feed-through contact 42 is surrounded by its own coaxial conductive sheath 48, but it is possible to rely on the plated through holes of the traces 22 to function as the conductive sheath about the material 46.
  • the wires 38, 40 are connected to the desired pins 44.
  • the wires may be, for example, soldered to the pins.
  • the sheath 48 has a collar 50 that prevents over-insertion of the feed-through contact 42 into the contact board 12.
  • the collar 50 also provides a contact surface when the probe card 10 is used with coaxial "pogo" pins 52.
  • the pogo pins 52 are spring-loaded contacts that bring the test lines from the measurement device 54 to the probe card 10.
  • the pogo pins 52 may be, for example, coaxial contacts having an inner conductor (unshown) that contacts the top of the pin 44 and an outer conductor that contacts the top of the collar 50.
  • the probe card 10 is connected between the measurement device 54 and the device under test.
  • the guard traces 20, 22 are connected by the outer conductor of respective pogo pins 52 to circuitry in the device 54 that forces the potential of the guards to a desired reference voltage.
  • the inner conductor of the pogo pin 52 connects a desired sense or force test line to a respective pin 44 and, ultimately, to the a respective needle tip 32.
  • feed-through contacts 42 completely isolates the test lines from the circuit boards 12, 14. This allows the measurement of electrical parameters involving currents of less than 10 -12 amperes. Settling times between measurements can often be reduced to less than a minute.

Abstract

A semiconductor probe card is provided with low dielectric absorption feed-through contacts to isolate test lines from printed circuit board leakage effects.

Description

BACKGROUND OF THE INVENTION
The invention relates to the field of semiconductor testing equipment and, in particular, to probe cards for semiconductor test equipment.
U.S. Pat. No. 4,983,907 shows a prior art probe card, and is incorporated herein in its entirety by reference. This card is intended for alternating current tests. It is unsuitable for very low current direct current tests, because charge carriers can move into (and out of) the dielectric material of the printed circuit boards from the traces carrying the test signals, resulting in incorrect measurements and/or excessive measurement times. For example, when currents smaller than 10-12 amperes are involved, the dielectric absorption of the typical glass-epoxy circuit board is sufficient to throw off measurements and to require settling times of as much as one-half hour.
Materials such as tetrafluoroethylene (e.g., Teflon) have a much lower dielectric absorption, but cost and mechanical considerations make it impractical to make circuit boards out of such materials.
SUMMARY OF THE INVENTION
A probe card for providing an electrical interface between a plurality of test lines and a device under test includes a contact board having a plurality of feed-through contacts therethrough. The contacts include a conductive pin surrounded longitudinally by an electrically insulating material sheathed in a conductive material. The pin has a first and second end. The test lines are electrically connectable to the feed-through contacts at the first end and the conductive material sheath is connectable to a reference voltage. It further includes, a probe board attached to the contact board. The probe board has a plurality of contact probes mounted on said probe board for contacting the device under test. Each probe has an electrical connection terminal, the connection terminal being connected by a wire to at least one of the feed-through contacts at the second end.
The card is used for connecting a measurement device having a plurality of test lines to a device under test to allow the utilization of currents of less than 10-12 amperes in the measurement of electrical parameters by connecting the probe card between said measurement device and the device under test.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of a probe card according to the invention.
FIG. 2 is an enlarged cross sectional side elevational view of a portion of a probe card according to the invention.
FIG. 3 is an enlarged top plan view of a portion of a contact board according to the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring to FIGS. 1 and 2, a probe card 10 is formed from a contact board 12 and a probe board 14. The boards 12, 14 are structurally attached to each other by a series of spacers 16 and are each in the form of a printed circuit board (e.g., glass-epoxy boards with electrically conductive gold traces).
Ceramic blade probes 18 are attached to guard traces 20 on the probe board 14. The guard traces 20 on the probe board 14 are electrically connected to guard traces 22 on the contact board 12 by the mating of a pin 24 on the contact board 12 and a socket 26 on the probe board 14.
The ceramic blade probes 18 are covered on one side (opposite the side shown in FIG. 2) and on the mounting edge 28 by a conductive material. The mounting edge 28 is soldered to the guard traces 20 to provide both an electrical and structural connection. The other side of the probes 18 have a signal conductor 30 terminating in a needle tip 32. The needle tip 32 is used to make contact with an unshown device under test. The blade probes 18 may be, for example, microstrip ceramic blade probes manufactured by Cerprobe Corporation of Tempe, Ariz.
In the preferred embodiment, a pin 34 is soldered to the signal conductor 30 to removably mate with a socket 36 soldered to one or more wires 38, 40 to be connected to the blade probe 18. For example, the wire 38 may be a "force" connection between the test equipment and the device under test and the wire 40 may be a "sense" connection between the test equipment and the device under test.
The pin and sockets 34, 36 and the pin and sockets 24, 26 provide a convenient way to separate the boards 12, 14 to allow the desired placement of blade probes 18 for a particular application.
Referring to FIGS. 2 and 3, coaxial feed-through contacts 42 mounted into holes in the contact board 12. In the preferred embodiment, the holes in the contact board are plated through as part of the guard traces 22 and the feed-through contacts 42 are press-fit into the board 12.
Each feed-through contact 42 includes a conductive pin 44 surrounded by a low dielectric absorption material 46. The material 46 may be, for example, tetrafluoroethylene (e.g., Teflon). In the preferred embodiment, each feed-through contact 42 is surrounded by its own coaxial conductive sheath 48, but it is possible to rely on the plated through holes of the traces 22 to function as the conductive sheath about the material 46.
The wires 38, 40 are connected to the desired pins 44. The wires may be, for example, soldered to the pins.
In the preferred embodiment, the sheath 48 has a collar 50 that prevents over-insertion of the feed-through contact 42 into the contact board 12. The collar 50 also provides a contact surface when the probe card 10 is used with coaxial "pogo" pins 52.
The pogo pins 52 are spring-loaded contacts that bring the test lines from the measurement device 54 to the probe card 10. The pogo pins 52 may be, for example, coaxial contacts having an inner conductor (unshown) that contacts the top of the pin 44 and an outer conductor that contacts the top of the collar 50.
In use, the probe card 10 is connected between the measurement device 54 and the device under test. The guard traces 20, 22 are connected by the outer conductor of respective pogo pins 52 to circuitry in the device 54 that forces the potential of the guards to a desired reference voltage. The inner conductor of the pogo pin 52 connects a desired sense or force test line to a respective pin 44 and, ultimately, to the a respective needle tip 32.
The use of the feed-through contacts 42 completely isolates the test lines from the circuit boards 12, 14. This allows the measurement of electrical parameters involving currents of less than 10-12 amperes. Settling times between measurements can often be reduced to less than a minute.
It should be evident that this disclosure is by way of example and that various changes may be made by adding, modifying or eliminating details without departing from the fair scope of the teaching contained in this disclosure. The invention is therefore not limited to particular details of this disclosure except to the extent that the following claims are necessarily so limited.

Claims (4)

What is claimed:
1. A probe card for providing an electrical interface between a plurality of test lines and a device under test, comprising
a contact board having a plurality of feed-through contacts therethrough, said contacts comprising a conductive pin surrounded longitudinally by an electrically insulating material sheathed in a conductive material, said pin having first and second ends and said test lines being electrically connectable to said feed-through contacts at the first end and said conductive material sheath being connectable to a guard reference voltage; and
a probe board attached to said contact board and having a plurality of contact probes mounted on said probe board for contacting said device under test, each probe having an electrical connection terminal, said connection terminal being connected by a wire to at least one of said feed-through contacts at the second end.
2. A probe card according to claim 1, wherein said electrically insulating material is tetrafluoroethylene.
3. A probe card according to claim 1, wherein said electrical connection terminal and said wire are connected by a pin and socket connector.
4. A method for connecting a measurement device having a plurality of test lines to a device under test to allow the utilization of currents of less than 10-12 amperes in the measurement of electrical parameters, comprising:
providing a probe card having:
a contact board having a plurality of feed-through contacts therethrough, said contacts comprising a conductive pin surrounded longitudinally by an electrically insulating material sheathed in a conductive material, said pin having first and second ends and said test lines being electrically connectable to said feed-through contacts at the first end and said conductive material sheath being connectable to a guard reference voltage; and a probe board attached to said contact board and having a plurality of contact probes mounted on said probe board for contacting said device under test, each probe having an electrical connection terminal, said connection terminal being connected by a wire to at least one of said feed-through contacts at the second end; and
connecting said probe card between said measurement device and said device under test.
US08/660,441 1996-06-07 1996-06-07 Semiconductor probe card for low current measurements Expired - Fee Related US5808475A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US08/660,441 US5808475A (en) 1996-06-07 1996-06-07 Semiconductor probe card for low current measurements

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US08/660,441 US5808475A (en) 1996-06-07 1996-06-07 Semiconductor probe card for low current measurements

Publications (1)

Publication Number Publication Date
US5808475A true US5808475A (en) 1998-09-15

Family

ID=24649548

Family Applications (1)

Application Number Title Priority Date Filing Date
US08/660,441 Expired - Fee Related US5808475A (en) 1996-06-07 1996-06-07 Semiconductor probe card for low current measurements

Country Status (1)

Country Link
US (1) US5808475A (en)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6034533A (en) * 1997-06-10 2000-03-07 Tervo; Paul A. Low-current pogo probe card
US6107816A (en) * 1997-04-30 2000-08-22 Lucent Technologies Inc. Test apparatus for time dependent dielectric breakdown
US6507208B2 (en) 1995-12-01 2003-01-14 Cascade Microtech, Inc. Low-current probe card
US6531876B1 (en) * 1998-06-18 2003-03-11 Ballard Power Systems Ag Apparatus for voltage measurement
US6541988B2 (en) 2001-06-12 2003-04-01 Lucent Technologies Inc. Circuit board test fixture with electrostatic discharge (ESD) protection
US20030062914A1 (en) * 2001-09-28 2003-04-03 Cosmin Iorga Surface mating compliant contact assembly with fixed signal path length
US20030189083A1 (en) * 2001-12-29 2003-10-09 Olsen Edward H. Solderless test interface for a semiconductor device package
US6995579B2 (en) 1995-12-01 2006-02-07 Cascade Microtech, Inc. Low-current probe card
DE102008045726A1 (en) 2007-09-19 2009-04-16 MJC Probe Inc., Chu-Pei Tester
US20100102837A1 (en) * 2007-03-26 2010-04-29 Advantest Corporation Connection board, probe card, and electronic device test apparatus comprising same
US7782070B2 (en) 2007-06-05 2010-08-24 Mjc Probe Incorporated Probing device
CN101545926B (en) * 2008-03-25 2011-05-11 旺矽科技股份有限公司 Probe testing device
CN101487853B (en) * 2008-01-16 2011-11-09 旺矽科技股份有限公司 High-speed test device
TWI385392B (en) * 2008-12-12 2013-02-11 High-frequency vertical probe device and its application of high-speed test card
TWI394951B (en) * 2008-11-13 2013-05-01

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3866119A (en) * 1973-09-10 1975-02-11 Probe Rite Inc Probe head-probing machine coupling adaptor
US4056777A (en) * 1974-08-14 1977-11-01 Electroglas, Inc. Microcircuit test device with multi-axes probe control
US4488111A (en) * 1982-06-01 1984-12-11 At&T Technologies, Inc. Coupling devices for operations such as testing
US4518914A (en) * 1981-08-03 1985-05-21 Japan Electronic Materials Corportion Testing apparatus of semiconductor wafers
US4899106A (en) * 1987-08-18 1990-02-06 Hewlett Packard Company Personality board
US4983907A (en) * 1987-05-14 1991-01-08 Intel Corporation Driven guard probe card
US5345170A (en) * 1992-06-11 1994-09-06 Cascade Microtech, Inc. Wafer probe station having integrated guarding, Kelvin connection and shielding systems

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3866119A (en) * 1973-09-10 1975-02-11 Probe Rite Inc Probe head-probing machine coupling adaptor
US4056777A (en) * 1974-08-14 1977-11-01 Electroglas, Inc. Microcircuit test device with multi-axes probe control
US4518914A (en) * 1981-08-03 1985-05-21 Japan Electronic Materials Corportion Testing apparatus of semiconductor wafers
US4488111A (en) * 1982-06-01 1984-12-11 At&T Technologies, Inc. Coupling devices for operations such as testing
US4983907A (en) * 1987-05-14 1991-01-08 Intel Corporation Driven guard probe card
US4899106A (en) * 1987-08-18 1990-02-06 Hewlett Packard Company Personality board
US5345170A (en) * 1992-06-11 1994-09-06 Cascade Microtech, Inc. Wafer probe station having integrated guarding, Kelvin connection and shielding systems
US5434512A (en) * 1992-06-11 1995-07-18 Cascade Microtech, Inc. Wafer probe station having integrated guarding, Kelvin connection and shielding systems
US5457398A (en) * 1992-06-11 1995-10-10 Cascade Microtech, Inc. Wafer probe station having full guarding

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6781396B2 (en) 1995-12-01 2004-08-24 Cascade Microtech, Inc. Low-current probe card
US6507208B2 (en) 1995-12-01 2003-01-14 Cascade Microtech, Inc. Low-current probe card
US7071718B2 (en) 1995-12-01 2006-07-04 Gascade Microtech, Inc. Low-current probe card
US6995579B2 (en) 1995-12-01 2006-02-07 Cascade Microtech, Inc. Low-current probe card
US6107816A (en) * 1997-04-30 2000-08-22 Lucent Technologies Inc. Test apparatus for time dependent dielectric breakdown
US6822467B2 (en) 1997-06-10 2004-11-23 Cascade Microtech, Inc Low-current pogo probe card
US20030117157A1 (en) * 1997-06-10 2003-06-26 Tervo Paul A. Low-current pogo probe card
US7148714B2 (en) 1997-06-10 2006-12-12 Cascade Microtech, Inc. POGO probe card for low current measurements
US20040017214A1 (en) * 1997-06-10 2004-01-29 Tervo Paul A. Low-current pogo probe card
US6559668B1 (en) 1997-06-10 2003-05-06 Cascade Microtech, Inc Low-current pogo probe card
US6034533A (en) * 1997-06-10 2000-03-07 Tervo; Paul A. Low-current pogo probe card
US7042241B2 (en) 1997-06-10 2006-05-09 Cascade Microtech, Inc. Low-current pogo probe card
US7068057B2 (en) 1997-06-10 2006-06-27 Cascade Microtech, Inc. Low-current pogo probe card
US6531876B1 (en) * 1998-06-18 2003-03-11 Ballard Power Systems Ag Apparatus for voltage measurement
US6541988B2 (en) 2001-06-12 2003-04-01 Lucent Technologies Inc. Circuit board test fixture with electrostatic discharge (ESD) protection
US20030062914A1 (en) * 2001-09-28 2003-04-03 Cosmin Iorga Surface mating compliant contact assembly with fixed signal path length
US6820794B2 (en) * 2001-12-29 2004-11-23 Texas Instruments Incorporated Solderless test interface for a semiconductor device package
US20030189083A1 (en) * 2001-12-29 2003-10-09 Olsen Edward H. Solderless test interface for a semiconductor device package
US20100102837A1 (en) * 2007-03-26 2010-04-29 Advantest Corporation Connection board, probe card, and electronic device test apparatus comprising same
US8134381B2 (en) * 2007-03-26 2012-03-13 Advantest Corporation Connection board, probe card, and electronic device test apparatus comprising same
US7782070B2 (en) 2007-06-05 2010-08-24 Mjc Probe Incorporated Probing device
DE102008045726A1 (en) 2007-09-19 2009-04-16 MJC Probe Inc., Chu-Pei Tester
CN101487853B (en) * 2008-01-16 2011-11-09 旺矽科技股份有限公司 High-speed test device
CN101545926B (en) * 2008-03-25 2011-05-11 旺矽科技股份有限公司 Probe testing device
TWI394951B (en) * 2008-11-13 2013-05-01
TWI385392B (en) * 2008-12-12 2013-02-11 High-frequency vertical probe device and its application of high-speed test card

Similar Documents

Publication Publication Date Title
US5808475A (en) Semiconductor probe card for low current measurements
US4740746A (en) Controlled impedance microcircuit probe
US7015708B2 (en) Method and apparatus for a high frequency, impedance controlled probing device with flexible ground contacts
KR100855208B1 (en) High performance tester interface module
US6768328B2 (en) Single point probe structure and method
US4996478A (en) Apparatus for connecting an IC device to a test system
US5703324A (en) Shielded banana plug with double shroud and input receptacle
US6348810B1 (en) Interface unit for a tester and method of connecting a tester with a semiconductor device to be tested
US4223968A (en) High-frequency etched circuit board connector
KR20040045620A (en) Air Interface Apparatus for Use in High Frequency Probe
JP2709570B2 (en) Positioning device for electric test probe
US5061892A (en) Electrical test probe having integral strain relief and ground connection
GB2166913A (en) Impedance matched test probe
EP0418525B1 (en) Device under test interface board and test electronic card interconnection in semiconductor test system
CA1098984A (en) Low-profile test clip adapter
US6498299B2 (en) Connection structure of coaxial cable to electric circuit substrate
US6022226A (en) Banana type electrical receptacle
US6894516B1 (en) Method and apparatus for implementing very high density probing (VHDP) of printed circuit board signals
WO2000004394A1 (en) Socket for device measurement, and method of measuring device
KR100560113B1 (en) Tester for Electric Devices
KR100337234B1 (en) high speed probe for test automation
JPH08248063A (en) Coaxial contact probe
KR100217068B1 (en) Test instrument interface
JPS63279179A (en) Measurement socket for integrated circuit apparatus
EP4101029A1 (en) Twinaxial cable splitter

Legal Events

Date Code Title Description
AS Assignment

Owner name: KEITHLEY INSTRUMENTS, INC., OHIO

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KNAUER, WILLIAM;BENNETT, ROBERT;REEL/FRAME:008076/0702

Effective date: 19960724

CC Certificate of correction
FPAY Fee payment

Year of fee payment: 4

FPAY Fee payment

Year of fee payment: 8

REMI Maintenance fee reminder mailed
LAPS Lapse for failure to pay maintenance fees
STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362

FP Lapsed due to failure to pay maintenance fee

Effective date: 20100915